Chemistry Assignments and Updates for November 17th
Dive into hydrolysis, predict the acidity of various compounds, solve for unknown salts, determine pH of solutions, explore acid strength expressions, and stay updated on textbook orders and upcoming tests in chemistry class.
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Presentation Transcript
Tuesday, November 17th Take out problem set 4, review questions 18-25, and your blue sheet Work on the following: 1. What is hydrolysis? 2. Predict whether aqueous solutions of the following compounds are acidic, basic, neutral and justify your answers: NH4Br FeCl3 Na2CO3 KClO4 NaHC2O4
Exciting News! New textbooks are being ordered (FINALLY!!!! ) They should arrive in January Hopefully we ll get the online access codes sooner
An unknown salt is either NaClO4, NaCl, or NaOCl. When a 0.050 mol of the salt is dissolved in water to form 0.500 L of solution, the pH of the solution is 8.08. What is the identity of the salt?
An unknown salt is either KBr, KCN, or K2CO3. If a 0.100M solution of the salt is neutral, what is the identity of the salt?
Sorbic acid (HC6H7O2) is a weak monoprotic acid with Ka= 1.7x10-5. Its salt (potassium sorbate) is added to cheese to inhibit the formation of mold. What is the pH of a solution containing 11.25g of potassium sorbate in 1.75L of solution?
pK A way of expressing the strength of an acid or base is pK pKa= log(Ka), Ka= 10 pKa pKb= log(Kb), Kb= 10 pKb The stronger the acid, the smaller the pKa. Larger Ka= smaller pKa Because it is the log The stronger the base, the smaller the pKb. Larger Kb= smaller pKb pKa+ pKb= 14.00 at 25 C
To Do Get any homework questions answered Problem set 5 (due tomorrow) cross off 117c and 121 Effects of Ka Lab (due tomorrow) I promise I will have lab reports graded before you turn in your next one Ch 15 test corrections Retake deadline: 11/24 Ch 16 test: 11/19 Ch 5 packet is online now You are responsible for printing it yourself 5.1-5.7 notes are due Monday, November 30th Ch 5 packet must be done by Monday, December 7th Key will be available 11/30 Ch 5 test will be Monday, December 14th
